Hello! At some point, a tonne of people in one of our OUs wanted to be able to see everyone else's calendar, this wasn't done by me (I'd have put the permission against a group, not every user). Unfortunately, these users now want to NOT be able to all see each other's calendars. I'm struggling to get this done in powershell as I'm pretty much an Amateur, I've gotten this far: get-mailbox -organizationalunit "ou=ou,dc=domain,dc=domain" | remove-mailboxfolderpermission -user "user" -confirm:$false Now, obviously this does remove a permission but only from the top level folder, not specifically the calendar. I've also tried "get-mailboxfolder *:\calendar" but this doesn't support describing the OU, and even if I wanted to apply it to the whole domain by removing -organizationalunit (which in theory shouldn't break anything as it's removing perms that the whole domain doesn't have anyway) it will only remove permissions for the administrator account of the whole OU. edit: I don't mind if I have to run a script for every user to remove their perms for every mailbox, that's just a matter of exporting the user list and copying the rest of the script in excel and doesn't increase the time it will take to do this by more than a few mins. Anyone able to help me with this? Regards Paddy

Is it Exchange 2010?Fiona Liao TechNet Community Support

Yes, Sorry, Exchange 2010. Forgot to mention this.

This seems to be working, however I get the error "pipeline not executing because a pipeline is already executing. Pipelines cannot be executed concurrently" it repeats this for every single mailbox and then starts working on about the last 5 mailboxes. It seems like it's trying to execute for multiple mailboxes at once. Is there any way to fix this? Regards Paddy

Hi, By default "Default" is assigned the permission AvailabilityOnly and I would think that you want to revert to that and you can do it by running: get-mailbox -organizationalunit domain.com/OU/someou | ForEach-Object {Add-MailboxFolderPermission $_":\Calendar" -User Default -AccessRights AvailabilityOnly} Martina Miskovic

Thanks! That solves the problem. I've learned a lot today. Regards Paddy

Thanks! That solves the problem. I've learned a lot today. Regards Paddy

Is it Exchange 2010?Fiona Liao TechNet Community Support

Yes, Sorry, Exchange 2010. Forgot to mention this.

This seems to be working, however I get the error "pipeline not executing because a pipeline is already executing. Pipelines cannot be executed concurrently" it repeats this for every single mailbox and then starts working on about the last 5 mailboxes. It seems like it's trying to execute for multiple mailboxes at once. Is there any way to fix this? Regards Paddy

Ok, Try this instead: $Mailboxes = get-mailbox -organizationalunit domain.com/OU/someou $Mailboxes | ForEach-Object {Add-MailboxFolderPermission $_":\Calendar" -User Default -AccessRights AvailabilityOnly} What is the permissions set on the calendar folder? Check with: Get-Mailboxfolderpermission alias:\calendarMartina Miskovic